GeoGraph - photograph every grid square

At first we thought it was a piece of shredded fabric that clung to several twigs on the ground. A closer inspection gave the impression that it was in fact a fungal growth. The mystery substance only appeared on twigs of which the bark was broken or absent. On contact with the hand it was found that the cotton wool like material melted immediately which showed that it was in fact an ice formation but how do you explain its formation? I'd love to know.